Air Quality in Portsmouth, United States
Drizzle
14.8°C · 71.3% humidity
14.8°
Feels 14.8°
31
Good
Air quality is satisfactory. Enjoy outdoor activities.
Model forecast
Nearby Monitoring Stations
Portsmouth's air quality — share it
AQI Forecast
25
3pm
25
25
31
6pm
27
27
25
9pm
25
25
25
12am
24
24
24
3am
24
24
24
6am
24
24
24
9am
24
24
24
12pm
24
24
Portsmouth's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration. Current PM2.5 concentration in Portsmouth is 1.5× the WHO annual guideline of 5 µg/m³.
71.3%
Humidity
46.7 km/h
Wind N
1020.0 hPa
Pressure
4.4
UV Moderate
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
7.35 µg/m³
PM10
20.55 µg/m³
050100150200300500
What is the weather forecast for Portsmouth?
Temperature & Precipitation
PM2.57.35 µg/m³
✓ WHO
Good
PM1020.55 µg/m³
Good
UV INDEX4.4
Moderate
What is the 7-day forecast for Portsmouth?
05-28
34.2° 21.4°
5.06 mm
05-29
30.2° 7.3°
0.56 mm
05-30
26.6° 17.0°
0.69 mm
05-31
31.3° 7.1°
06-01
30.2° 14.1°
0.13 mm
06-02
25.3° 10.3°
06-03
25.3° 21.6°
9.12 mm
Both models agree
Avg diff: 4.2°C
What cities are near Portsmouth?
Get AQI alerts for Portsmouth
Notify me when air quality reaches:
Free · No account · Unsubscribe any time
Data sources: Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-05-28T22:55 UTC.